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Machined pengun - Dimply

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Unread postAuthor: velocity3x » Sat Jul 09, 2011 5:29 am

Nice work, Jack. You should be very pleased with your new found skill.
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 09, 2011 5:49 am

velocity3x wrote:Nice work, Jack. You should be very pleased with your new found skill.


Thanks :) I wouldn't call it a skill yet, but i'm definitely pleased with my new tools :D
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Unread postAuthor: LeMaudit » Sat Jul 09, 2011 7:23 am

I didn't leave a round edge but it shouldn't compromise sealing *crosses appendages*


Well done!
I too had a regret about that... would have been better to leave the edge... oh well...

if you want to do the dimples on your pengun, I will prepare today the last step.

It will involve an additional fixture made on the lathe because I need some extra precision if we hope to have perfectly identical dimples. A little difference in depth will be a big difference in diameter.

I will not film the making of this fixture, but I am preparing right now a cutting plan that describe it. So you can be 100% on your own for this one! :D

[edit] Oh... damnit... I remember now you don't have a round end mill to do them :shock:
So you will need to use a flat one, and in that case you don't have really diameter change problems :D But I'll prepare the plan anyway.
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 09, 2011 7:28 am

LeMaudit wrote:Well done!


Cheers!

I too had a regret about that... would have been better to leave the edge... oh well...


I don't think it should be a problem... if not, redo the part ;)

It will involve an additional fixture made on the lathe because I need some extra precision if we hope to have perfectly identical dimples. A little difference in depth will be a big difference in diameter.


Am I good with the two flute end mill or are you going to use the ball mill?

I will not film the making of this fixture, but I am preparing right now a cutting plan that describe it. So you can be 100% on your own for this one! :D


Not as nervous as I would have been two weeks ago ;)
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Unread postAuthor: LeMaudit » Sat Jul 09, 2011 11:47 am

Step11A: a little centering fixture I made. It was a bad idea to rely on thread attachment to keep everything centered... one learn form his mistakes :wink:

This doesn't deserve a video, it took me more time to draw the plan than to cut the brass. But here's a few photographs and the cutting plan I followed.

Image

Image

Image

Image

Image

Now the aluminum cap and the lower part of the body don't have a visible wobble while turning, which is good enough (I hope).

Now Let's cut those darn dimples... I have no choice now.. except rename the thread title maybe... hmmm... argh! And all the video titles! :shock:
Nah, let's cut them :D
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Last edited by LeMaudit on Mon Jul 11, 2011 6:43 pm, edited 1 time in total.
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Unread postAuthor: warhead052 » Sat Jul 09, 2011 11:49 am

Have fun with the dimples! Can't wait to see this pengun completed, even though JSR already test fired his >.>
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 09, 2011 12:42 pm

I might not be able to work that way but I can appreciate the setup.

You know, you can glue the barrel and let it cure while you cut the dimples ;)
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Unread postAuthor: LeMaudit » Sat Jul 09, 2011 12:50 pm

Image
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 09, 2011 12:51 pm

... that and glue the schrader, you should be able to test it before the day is through!
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Unread postAuthor: LeMaudit » Sat Jul 09, 2011 12:55 pm

La la la la....

I'm not even sure I have the o-rings... I'll have to go and buy some tomorrow... that and some marine epoxy :D
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Unread postAuthor: Fnord » Sat Jul 09, 2011 1:09 pm

Did either of you ever consider buying a big o-ring set? If you can't find one on ebay I'm sure one of us could ship you some (unspecified) quality harbor freight o-rings.

Ok, they're actually decent quality. I bought a 400 piece metric set for $15 and haven't found any defective ones.
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 09, 2011 1:16 pm

LeMaudit wrote:that and some marine epoxy :D


:shock:

You don't have it yet?!

*gasp*

Coincidentally I bought these this morning :) doesn't include the AS568-109 size I need for the pen gun though so I bought 50 of them separately.
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Unread postAuthor: LeMaudit » Sat Jul 09, 2011 1:42 pm

quality harbor freight o-rings.


They are on sale right now at $7,99.... but damn, they don't ship to Canada :?
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Unread postAuthor: saefroch » Sat Jul 09, 2011 2:54 pm

So would anyone like to explain to me why JSR suggests marine epoxy?
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Unread postAuthor: ramses » Sat Jul 09, 2011 3:05 pm

saefroch wrote:So would anyone like to explain to me why JSR suggests marine epoxy?


Because He's on a boat.


Seriously, It is less viscus, and therefor flows better than the usual 5 minute stuff. It's probably stronger as well.
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